source/nmbd/nmbd_nodestatus.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-1998
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 /****************************************************************************
  27  Deal with a successful node status response.
  28 ****************************************************************************/
  29 static void node_status_response(struct subnet_record *subrec,
  30                        struct response_record *rrec, struct packet_struct *p)
  31 {
  32   struct nmb_packet *nmb = &p->packet.nmb;
  33   struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
  34   struct nmb_name *answer_name = &nmb->answers->rr_name;
  35
  36   /* Sanity check. Ensure that the answer name in the incoming packet is the
  37      same as the requested name in the outgoing packet. */
  38
  39   if(!nmb_name_equal(question_name, answer_name))
  40   {
  41     DEBUG(0,("node_status_response: Answer name %s differs from question \
  42 name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name)));
  43     return;
  44   }
  45
  46   DEBUG(5,("node_status_response: response from name %s on subnet %s.\n",
  47         nmb_namestr(answer_name), subrec->subnet_name));
  48
  49   /* Just send the whole answer resource record for the success function
  50      to parse. */
  51   if(rrec->success_fn)
  52     (*(node_status_success_function)rrec->success_fn)(subrec, rrec->userdata, nmb->answers, p->ip);
  53
  54   /* Ensure we don't retry. */
  55   remove_response_record(subrec, rrec);
  56 }
  57
  58 /****************************************************************************
  59  Deal with a timeout when requesting a node status.
  60 ****************************************************************************/
  61 static void node_status_timeout_response(struct subnet_record *subrec,
  62                        struct response_record *rrec)
  63 {
  64   struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
  65   struct nmb_name *question_name = &sent_nmb->question.question_name;
  66
  67   DEBUG(5,("node_status_timeout_response: failed to get node status from name %s on subnet %s\n",
  68            nmb_namestr(question_name), subrec->subnet_name));
  69
  70   if( rrec->fail_fn)
  71     (*rrec->fail_fn)(subrec, rrec);
  72
  73   /* Ensure we don't retry. */
  74   remove_response_record(subrec, rrec);
  75 }
  76
  77 /****************************************************************************
  78  Try and do a node status to a name - given the name & IP address.
  79 ****************************************************************************/
  80
  81 BOOL node_status(struct subnet_record *subrec, struct nmb_name *nmbname,
  82                  struct in_addr send_ip, node_status_success_function success_fn,
  83                  node_status_fail_function fail_fn, struct userdata_struct *userdata)
  84 {
  85   if(queue_node_status( subrec,
  86               node_status_response, node_status_timeout_response,
  87               success_fn, fail_fn, userdata, nmbname, send_ip)==NULL)
  88   {
  89     DEBUG(0,("node_status: Failed to send packet trying to get node status for \
  90 name %s, IP address %s\n", nmb_namestr(nmbname), inet_ntoa(send_ip)));
  91     return True;
  92   }
  93   return False;
  94 }